lens solution‚ sinks and showers. It can cause a number of opportunistic infections including infections of the skin‚ external ear canal and of the eye. Nitrifying bacteria recycle organic nitrogenous materials from ammonium (the endpoint for the decomposition of proteins) to nitrates. Their presence
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ICSE Class X Chapter 5 Hydrogen Chloride and Hydrochloric Acid Hydrogen chloride (HCl) : Formula : HCl Nature : Covalent. Molecular Mass : 36·5u [i.e. HCl = 1 + 35·5 = 36·5] Occurrence : (i) Present in gastric juices. (ii) Present in volcanic gases. Laboratory preparation of HCl gas : Hydrogen chloride gas is prepared in laboratory by heating conc. H2SO4 with NaCl. NaCl + H2SO4 Heat → NaCl + NaHSO4 Heat → NaHSO4 + HCl Sodium hydrogen sulphate Na2SO4 + HCl
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which solutions are soluble and which are not. We were able to see this by mixing certain solutions together and observing changes that occurred. The procedure for this experiment included a few different steps. The first steps were to add the nitrate solutions into the lettered parts of the 96-well plate. Once you were done with that‚ you were supposed to add the sodium solutions to the numbered parts of the 96-well plate‚ so that the solutions were added together. You were supposed to observe
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CHEMISTRY TOPIC 11 CHEMICAL CALCULATIONS CHEMICAL CALCULATIONS INTRODUCTION The first part of this ‘Chemical Calculations’ topic will help us to work out QUANTITIES involved in a reaction; For example‚ a manufacturer might want to know‚ How much ammonia will I produce from 20 tonnes of nitrogen in the Haber Process? To do these calculations you will need to be familiar with the term Ar (relative atomic mass)‚ Mr‚ Molar mass and Mole. Relative Atomic
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PROBLEM NUMBER 1 A farmer can plant up to 8 acres of land with wheat and barley. He can earn $5‚000 for every acre he plants with wheat and $3‚000 for every acre he plants with barley. His use of a necessary pesticide is limited by federal regulations to 10 gallons for his entire 8 acres. Wheat requires 2 gallons of pesticide for every acre planted and barley requires just 1 gallon per acre. What is the maximum profit he can make? SOLUTION TO PROBLEM NUMBER 1 let x = the number of acres of wheat
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living organisms in a continuous cycle. Bacteria are involved in all these steps except in assimilation process (citation) The first step in the nitrogen cycle‚ nitrogen fixation‚ involves the conversion of gaseous nitrogen (N2) to ammonia (NH3) or nitrate (NO3-). This process is termed nitrogen fixation because “nitrogen is fixed into a form that living things can use” (Berg et al.‚ 1993‚ p. 1162). There are many ways in which nitrogen could be fixed; these include by combustion‚ lightning discharges
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ensuring proper aeration by regularly turning the mixture. Worms and fungi further break up the material. Aerobic bacteria manage the chemical process by converting the inputs into heat‚ carbon dioxide and ammonium. The ammonium is further converted by bacteria into plant-nourishing nitrites and nitrates through the process of nitrification. Compost can be rich in nutrients. It is used in gardens‚ landscaping‚ horticulture‚ and agriculture. The compost itself is beneficial for the land in many ways‚ including
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outside intervention. In an isolated system‚ natural processes are spontaneous when they lead to an increase in disorder‚ or entropy. They may occur quickly‚ like the combustion of hydrogen‚ or slowly‚ like when graphite turns to diamond. Ex: Ammonium nitrate dissolves spontaneously in water‚ even though energy is absorbed when this reaction takes place. H2O NH4NO3(s) NH4+(aq) + NO3-(aq) Ho = 28.05
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05_Chem_GRSW_Ch09.SE/TE 6/11/04 3:33 PM Page 79 Name ___________________________ 9 Date ___________________ Class __________________ CHEMICAL NAMES AND FORMULAS SECTION 9.1 NAMING IONS (pages 253–258) This section explains the use of the periodic table to determine the charge of an ion. It also defines polyatomic ion and gives the names and formulas for the most common polyatomic ions. Monatomic Ions (pages 253–256) 1. What are monatomic ions? Monatomic ions are ions consisting of only one
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Chemistry Reference Tables Name Avogadro’s number Value 6.022 × 1023 particles/mole 0.0821 L atm mole K L mmHg 62.4 mole K 8.314 L kPa mole K 1.00 atm = 101.3 kPa = 760. mmHg = 760. torr 0°C or 273K 22.4 L Symbol Value Gas constant (R) Standard pressure Standard temperature Volume of 1 mole of any gas at STP Thermodynamic Constants Heat of fusion of water Heat of vaporization of water H f (water) Hv (water) 334 J/g 2‚260 J/g J for ice‚ 2.02 J for steam‚ g°C g°C J for liquid 4.18
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